Converting mp3 audio to mp2
I've been looking for quite a while now for a fairly simple Linux video editor that is able to incorporate still images - and I believe I've found what I'm looking for in the program MainActor. However, it doesn't appear to support mp3 format, and a post on their forums by one of their developers states that mp3 won't be supported.
What I'm wondering is, how can I convert mp3 audio to mp2 (which is supported) or mpa?
As an alternative, are there any 3rd party plugins available that will allow me to take mp3 input, ogg input, or wma input? Thanks!